<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script src="jquery.js"></script>
<link href="style.css" rel="stylesheet" type="text/css" />
</head>

<body>
<div class="banner">
  <img src="qietu/beijing.png" width="100%" height="100%"/>
  <div class="danwei">
     <p>河南省仪器设备管理公司</p>
     <span>仪器管理系统</span>  
  </div>
  <div class="banner1">
	<div class="login-form">
	  <form>
		<div class="yonghuming">
			<input type="text"  class="username" placeholder="请输入用户名"/>
		</div>
		<div class="mima">
			<input maxlength="6" type="password" class="username" placeholder="请输入密码">
		</div>
		<div class="yanzhengma">
			<input type="text" class="yanzheng" placeholder="请输入验证码"/>
            <img src="qietu/yanzhengma.png" class="yan"/>
		</div>
		<div class="tijiao">提交</div>
	</form>
	</div>
  </div>

 </div>


<script>

$(".yonghuming").find(".username").focus(function(){
	$(this).val("");	
})
$(".mima").find(".username").focus(function(){
	$(this).val("");	
})

$(".yanzhengma").find(".yanzheng").focus(function(){
	$(this).val("");	
})


</script>



</body>
</html>
